% \PassOptionsToPackage{showframe}{geometry}
\documentclass{exam-zh}
\usepackage{zhlipsum}
\examsetup{
  page/foot-content = {数学试题}
  % page/foot-content = {试题第;页}
  % page/foot-content = {试题第;页（共;页）}
}
\begin{document}

\zhlipsum[1-6]

\end{document}